Nick Gammon wrote a tutorial for achieving low power on Arduino class machines. It might be you can't go into a deep sleep, but hopefully you can save a reasonable amount of power: http://www.gammon.com.au/forum/?id=11497.
Nick Gammon wrote a tutorial for achieving low power on Arduino class machines. It might be you can't go into a deep sleep, but hopefully you can save a reasonable amount of power: http://www.gammon.com.au/forum/?id=11497.